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n in (-oo:+oo)
-n-4 = 4*n+56 // - 4*n+56
-n-(4*n)-56-4 = 0
-n-4*n-56-4 = 0
-5*n-60 = 0 // + 60
-5*n = 60 // : -5
n = 60/(-5)
n = -12
n = -12
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